Fuel Property Comparison for Ethanol, Gasoline and No. 2 Diesel

Fuel PropertiesSection: BIOFUELSFuel Property Comparison for Ethanol, Gasoline and No. 2 DieselPropertyEthanolGasolineNo. 2 DieselChemical FormulaC2H5OHC4 to C12C3 to C25Molecular Weight46.07100105200Carbon52.285888487Hydrogen13.112153316Oxygen34.700Specific gravity, 60 F/60 F0.7960.720.780.810.89Density, lb/gal @ 60 F6.616.06.56.77.4Boiling temperature, F17280437370650Reid vapor pressure, psi2.38150.2Research octane no.10890100--Motor octane no.928190--(R + M)/21008694N/ACetane no.(1)--5204055Fuel in water, volume %100NegligibleNegligibleWater in fuel, volume %100NegligibleNegligibleFreezing point, F-173.2-40-4030aCentipoise @ 60 F1.190.370.44b2.64.1Flash point, closed cup, F55-45165Autoignition temperature, F793495600Lower4.31.41Higher197.66Btu/gal @ 60 F2,378900700Btu/lb @ 60 F396150100Btu/lb air for stoichiometric mixture @ 60 F44108Higher (liquid fuel-liquid water) Btu/lb12,80018,80020,40019,20020000Lower (liquid fuel-water vapor) Btu/lb11,50018,00019,00018,00019,000Higher (liquid fuel-liquid water) Btu/gal84,100124,800138,700Lower (liquid fuel-water vapor) Btu/gal @ 60 F76,000b115,000128,400Mixture in vapor state, Btu/cubic foot @ 68 F92.995.296.9cFuel in liquid state, Btu/lb or air1,2801,290Specific heat, Btu/lb F0.570.480.43Stoichiometric air/fuel, weight914.7b14.7Volume % fuel in vaporized stoichiometric mixture6.52

&CBiomass Energy Data Book -- 2011 -- http://cta.ornl.gov/bedb